Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1979-12-10
1981-08-18
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77, 360106, 360 27, G11B 2108
Patent
active
042850150
ABSTRACT:
As an aid in counting servo tracks in a position servo system, a position window detector (30) which normally provides coarse and fine pulses to counting logic (53) also provides fine pulses to a reset switch (45) of a tachometer signal integrator means (33), resetting the integrator once for each track. In the event of position signal drop-out wherein coarse pulses are not properly generated, a threshold detection means (43) senses when the output of the integrator reaches a threshold level and produces a threshold reached signal which is transmitted to counting logic means (53) for incrementing a track counter (61).
REFERENCES:
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patent: 3458785 (1969-07-01), Sordello
patent: 3691543 (1972-09-01), Mueller
patent: 3737883 (1973-06-01), Sordello et al.
patent: 3755795 (1973-08-01), Sordello et al.
patent: 3864740 (1975-02-01), Sordello et al.
patent: 3883894 (1975-05-01), Johnson
patent: 4006394 (1977-02-01), Cuda et al.
patent: 4085427 (1978-04-01), Dunn
Rose Andrew M.
Sordello Frank J.
Touchton James J.
Battjer Eugene T.
Cleaver William E.
Schneck, Jr. Thomas
Sperry Corporation
Wolff John H.
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